Gyratory fan



July 16,1929.

F. DIEHL GYRATORY FAN Filed April 2'7, 1928 2 Sheets-Sheet l INVENTOR Frederick fizefil ATTORNEY WITNESS 4 ZZZ July. 16, 1929. F. DIEHL GYRA'I'ORY FAN Filed April 27, 1928 2 Sheets-Sheet 2 INVENTOR Eederiek fliel zl B ATTORNEY Patented July 16, 1929.

@UNHTED STATES Parent orr ca.

FREDERICK DIEHL, OF ELIZABETH, NEW JERSEY, ASSIGNOR 10 DIEHL MANUFAC- TURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY.

GYRATORY Fan.

Application filed April 27,

This invention relates to electric fans, more particularly of the gyratory type disclosed 111 the patent to F. Diehl, No. 1,099,693, of June 9,1914t, and has for an object to provide means for maintaining at all times efficient traction between the traction-wheel and the wheel runway of a fan of this type.

According to the present improvement a gyratory link or thrust-bar is provlded to hold the wheel in driving Contact with the track. One end of this bar is rotatably con-- nected to a gyratory center on the stationary frame support. The other end of the bar 1s connected to the fan-motor frame at the driving wheel axis; the sole function of such bar being to hold the driving wheel pressed upon the track. Preferably there incorporated in the bar a spring-pressed pm wh ch yieldingly bears upon the center connectlon and, by reaction, presses the bar away from such connection and causes the traction-wheel to be yieldingly pressed upon the track. The spring-pin affords a resilient thrust-connection between the fan-frame and the stationary-frame.

In the accompanying drawings, Fig. 1 is a side elevation, partly in section, of an electric fan embodying the invention. Fig. 2 is a section on the line 2-2, Fig. 1. Fig. 3 is a plan view of the speed-reduction gearing which connects the traction-wheel with the fan-motor shaft, and Fig. 4 is a perspective view of the thrust-member which holds the traction-wheel in driving engagement with i the track-way.

According to the preferred embodiment of the invention illustrated, 1 is a base having holes 2 for attaching screws and downwardly extending bolts 3 by which the inverted cupshaped frame 4 is secured to the base 1; this assembly constituting a stationary frame support in which the fan-motor frame 5 is universally mounted by being pivoted on trunnion-screws 6 carried by the ring 7 which is pivoted on trunnion screws 8 carried by the frame 4. The fan-motor frame has journaled in it the usual fan-shaft 9 carrying at its lower end the fan-blades 10 and at its upper end the worm 11.

The worm 11 meshes with the gear 12 on the cross-shaft 13 ournaled in bearing bosses 1 1 in the cup-shaped end-portion 15 of the fan-motor frame. The cross-shaft 13 has fixed to it a worm 16 which meshes with the ear 17 on the shaft 18 journa-led in the plate 1928. Serial NO. 273,187;

19 secured by screws 20 in the frame endportion 15. The shaft 18 has fixed to it a gear 21 which meshes with thegear 22 on the shaft journaledin the cap-member 24. Fixed to the shaft 23 is the cylindrical hub 25 of the traction-wheel 26 having the rubbertired rim 27 which runs on the circular trackway 28 formed on-the ring 29 secured by screws 30 to the frame 4;.

The frame 4% has secured to it, at the axis of gyration a of the fan 5, a cylindrical stud 31 which is embracedby the forked end 32 of the link or thrust-member 33, the opposite forked end 34 of which embraces the cylindrical hub 25 of the traction-wheel 26. The thrust-member 33 comprises two angularly related arms 35 and 36, the angle of which is the supplement of the angle between the motor-shaft 9 and the axis of gyration a-b.

The thrust-member 33 preferably has mounted in it a spring-pressed pin 37 which bears against the center-stud 31 and expands the thrust-member in effective length, causing the arm 36 thereof to press upon the side of the hub 25 and force the traction-wheel 26 against the track-way 28. Due to the resilient means between the stud 31 and track-way 28,

and the angular relation of the wheel aXis and the axis of gyration, the arm 35 of the link 33 is, by reaction, caused to bear upwardly against the flat bearing surface 38 within the frame 4; such bearing surface being parallel to and spaced from the plane of the track-way 28.

A washer 39, larger than the stud 31, is secured to the latter by the center screw 40 to hold the inner end of the link 33 from dropping away from the stud 31.

It will be observed that the side pressure is imparted to the traction-wheel 26 by the gyratory thrust-member 33 independently of the wheel-rim 27, which latter is not subjected to frictional wear other than that caused by its continuous rolling engagement with the track-way. The fan is found to be very quiet in operation, which is an import supporting frame having a circular trackway, a fan-motor having a frame universally mounted ln said supporting frame, a traction-wheel journaled in the fan-motor frame and connected to be driven by the fan-motor, and a gyratory thrustanember connected atits opposite ends to said frames and operating to hold the traction-wheel in driving engagement with said track-Way.

2. The combination set forth in claim 1 in which the thrust-member includes means for yieldingly expanding its effective length.

8. The combination set forth in claim 1 in which the thrust-member includes a spring expansion element.

4. The combination set forth in claim 1 in which the supporting frame and fan-motor frame carry center members and in which the thrust-member is forked at its opposite ends to embrace said members.

5. The combination set forth in claim 1 in which the thrust-member is formed with two angularly related arms, the angle of which is y the supplement of the angle between the fanmotor axis and the axis of gyration of the fan-motor.

6. In a gyratory fan, in combination, a supporting frame having a circular trackway, a fan-motor frame universally mounted in said supporting frame, a traction-wheel journaled on the fan-motor frame and adapted to run on said trackway to impart a gymtory movement to the fan-motor frame, a stud on the supporting frame at the axis of gyration, a hub on the traction-Wheel, and a thrust-bar bearing at its opposite ends upon said stud and hub.

7. In a gyratory fan, in combination, a supporting frame having a circular trackway and a bearing surface in a plane parallel to and spaced from the plane of the trackway, a fan-motor frame universally mounted in said supporting frame, a traction-wheel journaled on the fan-motor frame and adapted to run on said track-way to impart a gymtory movement to the fan-motor frame, and resilient means between the center of said bearing surface and the track-Way, said means including a thrust-bar connected at its opposite ends to said center and the aXis of the traction-wheel and bearing sidewise against said bearing surface.

In testimony whereof, I have signed my name to this specification.

FREDERICK DIEHL. 

